Embedding Java 8 modules

[lpandzic]

From jackson-dev google group:

I would also be interested in devising ways to embed Java 8 parameter name access dynamically, so that for 2.8 we could then embed this functionality, and eliminated need for parameter-names module. Further on would be handling of Optional type, and last Date/Time types (jsr310). I don't think there is absolute need to keep parameter name access as pluggable module if it can be automatically enabled while still allowing Java7 usage (for short/medium term).